High-Frequency Vibrating Stimuli Using the Low-Cost Coin-Type Motors for SSSEP-Based BCI

Figure 5

The average normalized amplitude from the fast Fourier transform of representative trials for both EEG signals of CP1-Cz and CP2-Cz electrodes. The red and blue lines depict the SSSEP signals induced by attention to the left and right vibration stimuli on contralateral electrode sites. The left and right accelerometer frequency peaks are illustrated in gray and black bold lines, respectively.